Fig, 93. — The life-cycle of Plasmodium vivax, 



< t Merogony, asexual reproduction which takes place in man; 8-13, gamogony, 

 or sexual reproduction, which takes place in the stomach of a mosquito ; 14-20, 

 sporogony, asexual reproduction in the body cavity of the mosquito. 



1, Infection of a red corpuscle ;_ 2, signet-ring stage ; 3, amoeboid stage ; 4, full- 

 grown meront preparing to divide; 5, multinucleate^ stage; 6, rosette stage, 

 corpuscle breaking up; 7, free merozoites ; ^ 8, infection of red corpuscles by 

 young gamonts ; 9, full-grown gamonts free in the mosquito's stomach; 10, 11, 

 formation of gametes ; 12, conjugation ; 13, zygote ; 14, invasion by zygote 

 fsporont) of endoderm cell of mosquito J 13, encystment ; 16, sporoblasts formed 

 by division of sporont ; 17, 18^ formation of sporozoites ; 19, invasion by latter 

 of salivary gland ; 20, sporozoites injected into blood of a man, 

 152 



